I can give an opportunity to you to make them bigger. The thing is that hitbox will stay the same (it has the perfect size IMO and changing it will break the right rhythm-feeling). And yes, I can add an option to recolour diamonds, I just need a little bit of time :)
If you have any other suggestion, I would like to listen to them.
UPD: I'm sorry but I lost the final version of the game so I can't add those options. Meh.